Inductor magneto



Jan, 1.3. 1925.

\ W. W. HAWKNS INDUCTOR MAGNETO Filed Jan. 6, 1922 2 Sheets-Sheet l mH/mww 2 Sheets-Sheet 2 w. w. HAwKlNs INDUcToR MAGNETO Filed Jan. e, 1922 Jan, 13'. 1925.

Patented Jan.13,1925. i

UNITED sTATEs,

Y 1,522,626 PATENT oFFlcE.

WILLIAM W. EAWKINS, OF BROOKLYN, NEW "YORK, ASSIGNOR T0 WEBSTER ELECTRIC COMPANY, 0F RACINE, WISCONSIN, A CORPORATION OF WISCONSIN.

INDUCTOR MAGNETO.

l' Application filed January 6, 1922. Serial No. 527,448.

To all whom t may concern:

Be itknown that I, WILLIAM W. HAW- xiNs, a' citizen of the United States, and resident of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful improvement in Inductor Magnetos, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to an inductor mag- 'neto and more particularly to an oscillating inductor magneto for ignition purposes. A

The inventlon contemplates a novel arl rangement of generating coil, inductor and core structure pole pieces characterized by the fact that a relatively small movement of the inductor serves to cause a complete, reversal of flux through the generating coil.

An importantv feature of my invention is the creation of comparatively little current in the generating winding upon the cocking movement of the rotor and a relatively large current upon thek recoil movement of the rotor.

The invention contemplates various improvements .in construction and arrangement of various parts which go to make up a simplified, efcient and generally improved ignition magneto of the oscillating inductor type.

In the accompanying drawings illustrating my invention:

Figure 1 is a vertical sectional view of the magneto of my invention, this view being` taken on the line 1-1 of Figure 2;

igure 2 is a horizontal sectional view taken on the.4 line 2 2 of Figure 1, the top wall of the magneto frame or housing being broken away;

Figure 3 is a diagram illustrating the position; Figure't is a similar view illustrating the rotor in cocked position.;

Figure 5 is a similar viewillustrating the rotor in ne of the intermediate positions through which it moves under recoil; and

Figure 6 is an elevation of the rotor shafts-1 and the inductor carried thereby.

' Similar characters of reference referA to similar parts throughout the several views.

Referring rst to"Figures 1 and 2, reference numeral 10 indicates a permanent magnet provided with oppositely disposed laminated pole pieces 11 and 12. A frame or housing 13 of non-magnetic material is` preferably cast in contact with the pole pieces, said frame or housing being .provided with side openings closed by removable side plates 1li-4.

rllhe pole pieces 11 and 12 are substantially F-shaped, but are reversely arranged, the projection a of each pole piece, however, lying in a horizontal plane coincident with the axis of the rotor presently to be described. The projection b of pole piece 11 liesabove said plane and a corresponding projection of pole piece 12 lies below said plane. j

The side plates 14-14 are provided with outwardly projecting hollow bosses 15-15 and disposed in said bosses are bearing bushing 16-16. lt will be noted that each of said bearing bushings extends inwardly a substantial distance beyond the inner face of the side plate by which it is carried. The purpose of this arrangement will presently appear.

Mounted in bearing bushings 16-16 is the rotor shaft 17 upon which is xed an inductor 18. Inductor 18 consists of a group of soft iron laminae forced upon or otherwise secured to the rotor shaft. The inductor laminae are preferably riveted between side plates 18a-18a.

now call attention to the suitably` wrapped generating coil 19. The coil extends from pole piece to pole piece and lies between the projections a and b of each pole piece. Thus a portion'of each of the coil turns lies above the rotor axis and a portion of each turn also lies below the rotor axis. The inwardly projecting portions of the bearing bushings 16 hold the coil out of contact with the rotor shaft. One end of the coil (notshown) is grounded to the magneto frame work and the other endof the coil, indicated at 20 is led upwardly through the top wall of the non-magneto framework 13,.as illustrated in Figure 1.l

The machine illustrated being an oscillator, the rotor shaft carries a yoke 21, the yoke being suitably keyed to the rotor shaft and being providedwith spring posts, as

illustrated` in Figure 2. Attached to each o-f these spring posts is a comparatively heavy tension spring 22, the other end of which is attached to a spring post carried by one rangement of f ing the same in both of thebrackets 23-23. The brackets 23-23 are screwed to the magneto frame work and incidentally serve to clamp the legs of the permanent magnet to the pole pieces. The rotor shaft is furtheri'i'lore provided with a push finger 24 which is formed integrally with the collar 25, said collar being keyed or otherwise fixed to the rotor shaft.

It will be understood that in the normal operation of the magneto, the push finger 24 is periodically engaged by a push rod or other engine driven actuator (not shown), moved against the tension of springs 24-24 and released, the s rings thereupon snapping the rotor rapldly toward its nor'mal position.

The diagram of Figure 3 illustrates the rotor in its normal position, and 'Figure 4 illustrates the rotor in its cocked position. It will be noted that movement of the rotor from one to the other of the two positions mentioned causes a complete reversal of flux through the generating coil, the direction of flux flow through the inductor, however, be-

ositions. A current is created in coil 19 w enever the inductor moves from its cocked position to its normal position, or vice versa. The wave created uring thecocking movement of the rotor of the present machine is found to be comparatively small. However, the wave created during the recoil movement of the rotor is-found to be comparatively large. This is a desirablearrangement because it is only the wave created on the recoil movement of.

the inductor that is utilized for ignition purposes. The wave created on the cocking movement being comparatively small, the utilized. wave builds up to a higher peak than would be possible if the wave produced on the cocking movement were a very large one..

It will be unnecessary to illustrate the circuit connections and auxiliary apparatus which is `utilized in connection with my improved magneto, as various combinations in which my magneto may be employed for ignition purposes will be apparent to persons skilled in the art to which my invention relates. A

Having thus illustratedoand described one embodiment of my invention, I do not limit myself to the specific construction and ararts herein shown and described, but wis to avail myself of all other embodiments 'of the invention'defined by the appended claims.

.jections in a horizontal What I claim is new and desire to secure by Letters Patent of the United States is:

1. An inductor `magneto comprising a magnet, a. pair of oppositely disposed pole pieces in contact with the poles of said magnet, each pole piece being of F shape and having a long polar projection and a shortpolar projection, an Ainductor rotatably mounted between saidy pole pieces, said inductor having two diametrically opposite arms, recoil spring mechanism normally holding said inductor with said arms in a horizontal plane, the short polar projections of said F shaped pole pieces l ing in a horizontal plane coincident with t e ends of said inductor arms when the latter are in their normal positions, said pole pieces being revcrsely arranged whereby the long polar projections are disposed respective] above and below this horizontal plane, an a generating coil extending from pole piece to polel piece and lying between said polar projections.

2. An inductor magneto comprising a magnet, a pair of oppositely disposed polepieces in contact with the poles o the magneto, each pole piece being of F shape and having a long polar projection, and a short polar projection, an inductor rotatably mounted between said pole pieces, said inductor having two :diametrically opposite arms, recoil spring mechanism normally holding said inductor with said arms in a horizontal plane, said pole pieces being reversely arranged with the short polar rolane coinci ent with the ends of said in. uctor arms and with the long polar rojections disposed respectively above and) below .this horizontal plane, the face of each long polar projection being displaced less than degrees from the .face of the corresponding short polar projection, a. generating coil extending from pole piece to pole piece and lying between thepolar projections of each pole piece, side plates wherein said inductor Ais mounted and bushings projecting inwardly from said side plates, said bushings being adapted to/hold the diagonal end portions yof said generating coil out of engagement with the inductor. In witness whereof, I 'hereunto `subscribe my name this 21-l day of December, 1921.

WM. W. HAWKINS. Witnesses:

B. TRUBENBAOK, EMILE Bomumors. 

